TL;DR
This paper investigates radiation from extremal Reissner-Nordström black holes during collapse, finding no neutral scalar radiation but emission of charged particles when charge-to-mass ratio differs from one, challenging some thermodynamic expectations.
Contribution
It provides a detailed calculation of radiation during collapse of charged shells, highlighting the emission of charged particles and clarifying entropy considerations for extremal black holes.
Findings
No neutral scalar radiation emitted.
Charged particles emitted if charge-to-mass ratio ≠ 1.
Emission results align with euclidean theory predictions.
Abstract
The radiation from extreme Reissner-Nordstr\"{o}m black holes is computed by explicitly considering the collapse of a spherical charged shell. No neutral scalar radiation is found but there is emission of charged particles, provided the charge to mass ratio be different from one. The absence of thermal effects is in accord with the predictions of the euclidean theory but since the body emits charged particles the entropy issue is not the same as for eternal extreme black holes.
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